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Efficient quantum computing using coherent photon conversion.

N K Langford1, S Ramelow, R Prevedel

  • 1Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria. nathan.langford@univie.ac.at

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|October 14, 2011
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Summary
This summary is machine-generated.

We introduce coherent photon conversion (CPC), a deterministic method for generating and processing quantum states. This advance offers a versatile toolkit for photonic quantum information applications, overcoming current inefficiencies in single-photon generation and manipulation.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Nonlinear Optics

Background:

  • Single photons are key quantum information carriers, enabling entanglement demonstrations.
  • Current methods for preparing, processing, and measuring single photons are inefficient and probabilistic.
  • Existing techniques like down-conversion produce randomly timed photons, and linear optics gates are inherently probabilistic.

Purpose of the Study:

  • Introduce a deterministic process for generating and processing complex, multiquanta states for photonic quantum information.
  • Present coherent photon conversion (CPC) as a versatile solution to overcome current limitations.
  • Provide a full set of photonic quantum processing tools satisfying DiVincenzo criteria for scalable quantum computing.

Main Methods:

  • Utilize classically pumped nonlinearities to induce coherent oscillations between orthogonal states of multiple quantum excitations.
  • Employ a pumped four-wave-mixing interaction as a specific example of CPC.
  • Experimentally demonstrate quantum correlations from a four-color nonlinear process using photonic crystal fibers.

Main Results:

  • CPC provides a single, versatile process for a full suite of photonic quantum processing tools.
  • Achieved deterministic multiqubit entanglement gates and high-quality heralded single- and multiphoton states.
  • Demonstrated robust, high-efficiency detection and potential for improved down-conversion with reduced higher-order effects.

Conclusions:

  • Coherent photon conversion (CPC) offers a deterministic pathway for advancing photonic quantum information applications.
  • The developed tools satisfy DiVincenzo criteria, paving the way for scalable quantum computing architectures.
  • The scheme is adaptable to other physical systems and can be extended using higher-order nonlinearities for multiparty mediation.